Platform-rocker.



No) 714,750. Patented nee. 2, |902.

w. P. sans.

PLATFURM ROCKER.

[Application led Sept. 4, 1902.) (No Model.)

llllllll iumm UNTTED STATES PATENT OFFICE.

WENDELIN P. SENG, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE SENG COM- PANY, OF CHICAGO, ILLINOIS, A vCORPORATION OF ILLINOIS.

PLATFORM-HOOKER.

SPECIFICATION forming part of Letters Patent No. 714,750, dated December 2, 1902.

Application liled September 4:, 1902. Serial No. 122,035. (No model.)

To @ZZ whom it may concern.-

Be it known that I, WENDELIN P. SENG, a citizen ofthe United States, residing at Chicago, in the county of Cook and State of Illinois, have invented newand useful Improvements in Platform-Rockers, of which the foling is a specification.

This invention relates to improvements in chairs commonly designated as platformro rockers, and which comprisea pair of oppositely-arranged springs employed as the sustaining means and located between the seat and platform, whereby said seat is adapted to rock much after the fashion of an ordinary l5 rocker, all as particularly set forth in United States Patent No. 360,589, granted April 5, 1887 to John Harrington.

One of the main difficulties in assembling this chair and others operating upon the same zo principle is to properly relatively adjust the spring and seat so that the latter will be poised and not tilt either backward or forward when unoccupied. For the purpose of securing the springs to the seat, clamps are z 5 ordinarily employed, which are secured by screws or bolts to the'chair-bottoms. A proper positioning of these springs can only be secured by-a series of experiments, or at least such hasbeen the case heretofore, such experiments consisting in boring the holes for the bolts or screws, applying the clamps and springs, and then if not properly positioned to remove the clamps, springs, and screws, ill up the holes, rebore, and reapply, such ex- 3 5 periments being carried on until the parts appeared to be properly relatively positioned.

The main object of the present invention is to avoid this heretofore necessarily laborious and expensive manner of applying these 4o springs and to provide a very simple means for securing the springs to the chair-bottom in such manner as will readily permit of any slight adjustment of thechair-bottom with relation to the clamps and springs.

With this object in view the invention consists in providing the clamp along its curved or raised portion wherein lies the spring with a series of holes into any of which is designed y to engage adownwardly-extending pin fixed 5o in the spring, so that when the clamps and springs are in position and it is found that the seat is not properly poised with relation to the latter it will be only necessary to loosen the bolts sufficiently to enable the clamps to be dropped and the engaging pins to be withdrawn and the seat slightly moved,

Vwhereby the said pins are brought opposite and into engagement with the next succeeding holes and the bolts o1' screws retightened, such adjustments being carried on until a 6o proper point is reached.

In the drawings, Figure l represents a side elevation of a portion of a chair, `its platform, and a spring, the spring and chair-bottom being secured together in accordance with my 65 invention. Fig. 2 is a vertical transverse sectional view, on the line 2 2 of Fig. l, of the clamp and transverse securing-board. Fig.

3 is a detail of that portion of the spring in which is located the locking-pin. Fig. 4 is a 7o bottom plan view of the clamp in detail and that portion of the spring contained Within the same. Y

Similar nu merals of reference indicate similar parts throughout the drawings.

l designates the chair-bottom, 2 the base, and 3 the securing-board, all being of the conven tional form in the style of chair referred to.

The two springs-there being one at each side of the chair, as will be readily under- 8o stood-are designated as 4 and each comprises opposite coils 5, an upper intermediary connecting portion 6, and lower intersecting supporting-arms 7, the ends of the latter being suitably connected, as by clips 8, to the platform 2. At a central point in the upper intermediary portion 6 is seated a depending stud or pin 9. The board 3 is centrally positioned under the chair l by screws,which pass upwardly through the former into the sides 9o of the latter, and between the under surface of the board and the upper side of the said spring may be located a thin wearing-plate lO to prevent the said'lboard from being chafed by the spring and constitute a firm surface, against which the said spring may be clamped.

The clamp ll is preferably formed of sheet metal and is rectangular in shape and provided with a central longitudinally-disposed groove l2 throughout its length and which is roo of such diameter as to adapt it to substantially receive the upper intermediary portion 6 of the spring. This depression or groove 12 is provided with a series of alining holes or perforations 13, in any one of which is designed to engage the depending pin or stud 9 of the spring 4. At suitable points, as near its four corners, the clamp is also perforated to 'receive the securing-bolts 14, which pass up through the said holes formed in the securing-board 3, at which points they are provided with suitable Washers 15 and nuts 16.

Of course it will be understood that the securing-board 3 may be merely 'a sheet of metal instead of wood, in Which case the bearing or wear plate 10 might be omitted; also, means other than the bolts 14 will readily suggest themselves for securing the clamps 11 in position.

The operation of the invention will be readily understood from the foregoing description. The securing-board 3, with the holes for the accommodation of the bolts 14, having been placed in position, the springs with the clamps are then placed in position, the said springs having been previously mounted on the platform. If when the bolts are tightened up it isfound that the chair is not properly poised, it is simply necessary to slightly loosen the bolts 14 sufciently to permit the clamps to fall or lower and disengage the studs or pins 9 therefrom. The seat may then be moved backward or forward, whichever is necessary with relation to the springs, and the bolts retightened, such operation being repeated until a proper adjustment is reached. In this manner it will be seen that no removal of the screws, reboring and plugging of old holes is required, and as a whole the application of the springs greatly facilitated.

Having described my invention, what I claim is- 1. In combination, with a chair, a platform and spring, the latter having a projecting stud or pin, a clamp curved in cross-section to receive the spring and provided with a plurality of holes adapted to receive the pin or stud, and means for securing the said clamp to the chair.

2. In combination with a chair, a platform and a spring the latter having a depending pin or stud, a clamp curved to receive the spring and extending at each side thereof, holes formed in the clamp and adapted to receive the pin or stud, and securing-bolts for the clamp whereby the latter is held in adjustable relation to the chair.

3. In combination, with a chair, a platform and spring, the latter having a projecting stud or pin, a clamp having a depression to receive the spring and extending at each side thereof and provided along its depression with a series of holes adapted to receive the stud or pin, a wear-plate covering the depression and the spring, and means for securing the clamp against the under side of the chair-seat.

4. In combination, with a chair, aplatform and the spring 4, the board 3 secured to the chair-seat, the clamp 11, having the depression 12 provided with the perforations 13, the wear-plate 10, the stud 9 depending from the spring, and the securing bolts 14, passed through the clamp and board.

In testimony whereof I affix my signature in presence of two witnesses.

VVENDELIN P. SENG.

Witnesses:

L. L. BALL, F. J. SENG. 

